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-rw-r--r--internal.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/internal.h b/internal.h
index bf54c64be7..f2e726ce6e 100644
--- a/internal.h
+++ b/internal.h
@@ -368,7 +368,7 @@ ntz_intptr(uintptr_t x)
# define DL2NUM(x) LL2NUM(x)
#elif defined(HAVE_INT128_T)
# define DLONG int128_t
-# define DL2NUM(x) (RB_FIXABLE(x) ? LONG2FIX(x) : rb_int128t2big(x))
+# define DL2NUM(x) ((RB_POSFIXABLE(x) && RB_NEGFIXABLE(x)) ? LONG2FIX(x) : rb_int128t2big(x))
VALUE rb_int128t2big(int128_t n);
#endif